Whats up guys? So to start off with this, I want to tell you guys what I've done to this thing so that you can maybe have a more clear way of answering or giving input to what my problem is. I have a 2000 GMC Sierra Z-71. I have upgraded my rear diff with a limited slip about 2 years ago. I have also leveled it and replaced the T-case and the front diff. The T-case is from a suburban and the front diff is from another Z-71. When I put this thing in 4wd the front end wants to pull to the left and to the right. It doesn't want to track just straight. It's not something that you "can just tolerate" either as it's dangerous driving this way in the snow. Any ideas of what would be causing this thing to not track straight in 4wd?